Rotation control device of multi-rotor ceiling fan

ABSTRACT

A rotation control device of a multi-rotor ceiling fan includes a fixed unit. The fixed unit is provided with a fixed gear. The fixed unit is pivotally connected with a movable unit. A driving member is fixed to the movable unit. The driving member has a driving gear. The driving gear meshes with the fixed gear. The driving member is provided with at least one pair of support rods. The distal ends of the support rods are respectively connected with a fan. The driving member brings the movable unit to turn at a constant speed relative to the fixed unit for the fans to revolve round the fixed unit, producing stable airflow to the surrounding by 360-degree rotation.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a rotation control device of amulti-rotor ceiling fan.

2. Description of the Prior Art

FIG. 1 is a side view of a conventional multi-rotor ceiling fan. Theconventional multi-rotor ceiling fan comprises a shaft 1. One end of theshaft 1 is pivotally connected with a seat member 2. The other end ofthe shaft 1 is fixed to the ceiling (not shown in the drawing). Theshaft 1 is provided with a power supply portion 3 which is located closeto the seat member 2. The seat member 2 is provided with a correspondingload portion 4. The load portion 4 gets contact with the power supplyportion 3. The seat member 2 is provided with a pair of support rods 5extending outward. The distal ends of the support rods 5 arerespectively connected with a fan 6. The fans 6 are electricallyconnected to the load portion 4. When the multi-rotor ceiling fan isstarted, the power supply portion 3 will supply power to the loadportion 4. The load portion 4 further transmits the power supply to thefans 6, such that the fans 6 are rotated. By the inertia force generatedby rotation of the fans 6, the fans 6 also revolve round the seat member2, producing airflow to the surrounding by 360-degree rotation.

However, because the fans 6 revolve round the seat member 2 by theinertia force generated by rotation of the fans, the revolution speed ofthe fans 6 will be influenced by the rotation speed of the fans 6. Thatis to say, the higher the rotation speed, the higher revolution speedthere will be. That results in that the conventional multi-rotor ceilingfan cannot produce stable airflow to the surrounding by 360-degreerotation. Accordingly, the inventor of the present invention has devotedhimself based on his many years of practical experiences to solve theseproblems.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a rotationcontrol device of a multi-rotor ceiling fan to produce stable airflow tothe surrounding by 360-degree rotation.

In order to achieve the aforesaid object, the rotation control device ofa multi-rotor ceiling fan of the present invention comprises a fixedunit, a fixed gear, a movable unit, and a driving member. The fixed unithas a housing. The housing has an accommodation room and an opening atone side thereof. The housing further has an axial hole at another sidethereof. The fixed unit comprises a shaft connected to the axial hole.The shaft is provided with a power supply portion. The fixed gear isfixed to the fixed unit. The fixed gear has a fixed toothed portionwhich is disposed round the shaft. The movable unit comprises a seatmember which is pivotally connected to the shaft. The movable unitcomprises at least one pair of support rods extending outward from theseat member and disposed relative to the shaft. The distal ends of thesupport rods are respectively connected with a fan. The seat member ofthe movable unit is provided with a load portion. The load portion getscontact with the power supply portion. The driving member is fixed tothe movable unit and has a motor. The motor is electrically connected tothe load portion. The motor is further connected with a driving gear.The driving gear has a driving toothed portion. The driving toothedportion meshes with the fixed toothed portion.

The driving member is fixed to the seat member, the seat member ispivotally connected to the shaft, and the fixed gear is fixed to theshaft and not free. When the multi-rotor ceiling fan is started, thedriving gear is moved along the inner edge of the fixed gear andsynchronously brings the seat member to rotate with the shaft as thecenter shaft. Thus, the movable unit turns at a constant speed relativeto the fixed unit for the fans connected to the support rods to revolveround the fixed unit, producing stable airflow to the surrounding by360-degree rotation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a conventional multi-rotor ceiling fan;

FIG. 2 is a perspective view according to a first embodiment of thepresent invention;

FIG. 3 is a sectional view according to the first embodiment of thepresent invention;

FIG. 4 is a schematic view showing operation of the first embodiment ofthe present invention;

FIG. 5 is a perspective view according to a second embodiment of thepresent invention; and

FIG. 6 is a sectional view according to the second embodiment of thepresent invention.

FIG. 7 is a schematic view showing operation of the second embodiment ofthe present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way ofexample only, with reference to the accompanying drawings.

As shown in FIG. 2 and FIG. 3, the rotation control device 100 of amulti-rotor ceiling fan according to a first embodiment of the presentinvention comprises a fixed unit 10, a fixed gear 20, a movable unit 30,and a driving member 40.

The fixed unit 10 has a housing 11. The housing 11 has an accommodationroom 111 and an opening 112 at one side thereof. The housing 11 furtherhas an axial hole 113 at another side thereof. The fixed unit 10comprises a shaft 12 connected to the axial hole 113. The shaft 12 isprovided with a power supply portion 13.

The fixed gear 20 is an annular member 21 which is fixed to the fixedunit 10. The fixed gear 20 has a fixed toothed portion 22 which isdisposed round the shaft 12. In this embodiment, the annular member 21has an outer annular surface 211 and an opposing inner annular surface212. The outer annular surface 211 is fixed to the opening 112 of thehousing 11. The inner annular surface 212 has the fixed toothed portion22 thereon.

The movable unit 30 comprises a seat member 31 which is pivotallyconnected to the shaft 12. The seat member 31 has a lower seat 311 whichis pivotally connected to the shaft 12 and an upper seat 312 which islocated above the lower seat 311. The movable unit 30 comprises at leastone pair of support rods 32 extending outward from the lower seat 311 ofthe seat member 31 and disposed relative to the shaft 12. The distalends of the support rods 32 are respectively connected with a fan (notshown in the drawings). The upper seat 312 of the seat member 31 of themovable unit 30 is provided with a load portion 33. The load portion 33gets contact with the power supply portion 13.

The driving member 40 is fixed to the lower seat 311 of the movable unit30 and has a motor 41. The motor 41 is electrically connected to theload portion 33. The motor 41 is further connected with a driving gear42. The driving gear 42 has a driving toothed portion 421. The drivingtoothed portion 421 meshes with the fixed toothed portion 22.

FIG. 4 is a schematic view showing operation of the first embodiment ofthe present invention. When the multi-rotor ceiling fan is started, thepower supply portion 13 will supply power to the load portion 33. Theload portion 33 further transmits the power supply to the motor 41, suchthat the motor 41 runs to drive the driving gear 42 to turn. Because thedriving member 40 is fixed to the seat member 31 and the seat member 31is pivotally connected to the shaft 12 and the fixed gear 20 is fixed tothe shaft 12 and not free, the driving gear 42 is moved along the inneredge of the fixed gear 20 as shown in FIG. 4 and synchronously bringsthe seat member 31 to rotate with the shaft 12 as the center shaft.Thus, the movable unit 30 turns at a constant speed relative to thefixed unit 10 for the fans connected to the support rods 32 to revolveround the fixed unit 10, producing stable airflow to the surrounding by360-degree rotation.

It is noted that the fixed toothed portion 22 of the fixed gear 20meshes with the driving toothed portion 421 of the driving gear 42 toresist the inertia force generated by rotation of the fans. Therefore,the movable unit 30 can be turned steady relative to the fixed unit 10by the driving member 40, not influenced by the rotation speed of thefans.

FIG. 5 is a perspective view according to a second embodiment of thepresent invention. FIG. 6 is a sectional view according to the secondembodiment of the present invention. The rotation control device 100 ofthe multi-rotor ceiling fan of the second embodiment is substantiallysimilar to the first embodiment with the exceptions describedhereinafter. The fixed gear 20 is a disc member 23. The disc member 23has a through hole 231 at a central portion thereof for connection ofthe shaft 12. The disc member 23 is fixed to the shaft 12 and locatedbetween the lower seat 311 and the upper seat 312. The disc member 23has the fixed toothed portion 22 around an outer wall thereof. The fixedtoothed portion 22 meshes with the driving portion 421 of the drivingmember 40. The fixed gear 20 is fixed to the shaft 12 and not free. Whenthe multi-rotor ceiling fan is started, the driving gear 42 is movedalong the inner edge of the fixed gear 20 as shown in FIG. 7 andsynchronously brings the seat member 31 to rotate with the shaft 12 asthe center shaft. Thus, the movable unit 30 turns at a constant speedrelative to the fixed unit 10 for the fans connected to the support rods32 to revolve round the fixed unit 10, producing stable airflow to thesurrounding by 360-degree rotation. The second embodiment achieves thesame effect as the first embodiment.

Although particular embodiments of the present invention have beendescribed in detail for purposes of illustration, various modificationsand enhancements may be made without departing from the spirit and scopeof the present invention. Accordingly, the present invention is not tobe limited except as by the appended claims.

What is claimed is:
 1. A rotation control device of a multi-rotorceiling fan, comprising: a fixed unit having a housing, the housinghaving an accommodation room and an opening at one side thereof, thehousing further having an axial hole at another side thereof, the fixedunit comprising a shaft connected to the axial hole, the shaft beingprovided with a power supply portion; a fixed gear fixed to the fixedunit, the fixed gear having a fixed toothed portion which is disposedround the shaft; a movable unit comprising a seat member which ispivotally connected to the shaft, the movable unit comprising at leastone pair of support rods extending outward from the seat member anddisposed relative to the shaft, distal ends of the support rods beingrespectively connected with a fan, the seat member of the movable unitbeing provided with a load portion, the load portion getting contactwith the power supply portion; and a driving member fixed to the movableunit and having a motor, the motor being electrically connected to theload portion, the motor being further connected with a driving gear, thedriving gear having a driving toothed portion, the driving toothedportion meshing with the fixed toothed portion.
 2. The rotation controldevice of a multi-rotor ceiling fan as claimed in claim 1, wherein thefixed gear is an annular member, the annular member having an outerannular surface and an opposing inner annular surface, the outer annularsurface of the annular member being fixed to the opening of the housing,the inner annular surface having the fixed toothed portion thereon. 3.The rotation control device of a multi-rotor ceiling fan as claimed inclaim 1, wherein the fixed gear is a disc member, the disc member havinga through hole at a central portion thereof for connection of the shaft,the disc member being fixed to the shaft, the disc member having thefixed toothed portion around an outer wall thereof.